Reset mikrotik router Rb951ui-2hnd openwrt os

Hi
I installed it on the openwrt router but it doesn't boot
How to make a hard reset

@Sadra

Please use the following guide to get your RB951 back to a workable state:
https://wiki.mikrotik.com/wiki/Manual:Netinstall

Then let us know how you tried to install Openwrt to your RB951 and what version you tried to install?